81067388843 has 6 divisors (see below), whose sum is σ = 94302880956. Its totient is φ = 69486333252.

The previous prime is 81067388819. The next prime is 81067388849. The reversal of 81067388843 is 34888376018.

It is a happy number.

It is not a de Polignac number, because 81067388843 - 2¹⁶ = 81067323307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81067388849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 827218205 + ... + 827218302.

It is an arithmetic number, because the mean of its divisors is an integer number (15717146826).

Almost surely, 2^81067388843 is an apocalyptic number.

81067388843 is a deficient number, since it is larger than the sum of its proper divisors (13235492113).

81067388843 is a wasteful number, since it uses less digits than its factorization.

81067388843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654436521 (or 1654436514 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 56.

The spelling of 81067388843 in words is "eighty-one billion, sixty-seven million, three hundred eighty-eight thousand, eight hundred forty-three".